code: def test_api_key_and_client_options(self):
      # Client options should merge with an API key, as long as they are both
      # do not have the key set.
      client_opts = client_options.ClientOptions(
          api_endpoint="web.site"
      )
      client.configure(
          api_key="AIzA_client", client_options=client_opts
      )
  
      actual_client_opts = client._client_manager.client_config[
          "client_options"
      ]
      self.assertEqual(actual_client_opts.api_key, "AIzA_client")
      self.assertEqual(actual_client_opts.api_endpoint, "web.site")
  
file_path: generative-ai-python/tests/test_client.py
imports: import os
  from unittest import mock
  from absl.testing import absltest
  from absl.testing import parameterized
  from google.api_core import client_options
  import google.ai.generativelanguage
  from google.generativeai import client
label_desc: Use image node_id 6 for calling the ClientTests obj's underlying member method code with example usage: obj.test_api_key_and_client_options() without return types